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Autistic British artist Stephen Wiltshire who is known for his ability to create entire cityscapes from memory is tackling one of his biggest challenges yet – Mexico City.

Using his astonishingly accurate near photographic memory Wiltshire started sketching what he’d seen based on a half-hour helicopter flight the day before.

The artist’s vision quickly began to emerge in remarkable detail: Mexico City’s World Trade Center, a boxy skyscraper with a cylindrical crown that dominates a south-central neighborhood, and the backdrop of volcanic mountains that ring the capital.

For this special commission Wiltshire will spend about 40 hours finishing the project, drawing seven hours a day with breaks to eat.